Huge state file
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
After saving the 1st state file, opening it, doing some operations, saving the 2nd state file, opening the 2nd one, doing more operations, saving the 3rd state file. After several iterations, the saved state file becomes very large, and it takes a very long time to open it again. Note that between operations "Delete All" was clicked. Attached is such a huge state file.